/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraDataChannelAccessor.h
Call before each access to the data channel to grab the correct data to read.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=NiagaraDataChannel, Meta=(Keywords="Niagara DataChannel")) bool InitAccess ( [FNiagaraDataChannelSearchParameters](API\Plugins\Niagara\FNiagaraDataChannelSearchParamet-) SearchParams, bool bReadPrevFrameData )